EP3011184A1 - Pumpengehäuse aus einem magnetischen und einem nichtmagnetischen material - Google Patents
Pumpengehäuse aus einem magnetischen und einem nichtmagnetischen materialInfo
- Publication number
- EP3011184A1 EP3011184A1 EP14738377.2A EP14738377A EP3011184A1 EP 3011184 A1 EP3011184 A1 EP 3011184A1 EP 14738377 A EP14738377 A EP 14738377A EP 3011184 A1 EP3011184 A1 EP 3011184A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump housing
- housing
- pump
- alloy
- range
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/021—Units comprising pumps and their driving means containing a coupling
- F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/181—Axial flow rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/528—Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D3/00—Axial-flow pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/40—Heat treatment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/13—Refractory metals, i.e. Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
- F05D2300/133—Titanium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/20—Oxide or non-oxide ceramics
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/507—Magnetic properties
Definitions
- the invention relates to a pumping device comprising i. an impeller; ii. a pump housing surrounding at least a portion of an inner portion with an inlet and an exhaust, the impeller being provided in the interior of the pump housing; wherein the wall of the pump housing in at least one plane (Q) perpendicular to the longitudinal extent of the pump housing has at least a first portion and at least two further portions; wherein the at least one first portion includes at least one non-magnetic material, the further portions each including at least one ferromagnetic material, each further portion in the plane (Q) being adjacent to at least a first portion, and the at least one first portion Subarea and the other sections are connected to each other cohesively. Furthermore, the invention relates to a housing which includes the features described for the pump housing.
- the invention also relates to a method of manufacturing a pump housing, comprising the steps of: a providing a first material; b. Providing another material; c. Forming a Pumpengephaseusevorierirs, wherein at least a first portion of the pump housing of the first material, and wherein at least two further portions of the pump housing are formed from the further material; and d. Treat the pump housing precursor at a temperature of at least 300 ° C.
- Pumping devices with rotors or impellers are known. Some pumping devices have as a conveying path for a fluid to be pumped on a pump housing in the form of a tube. This is often an impeller, which is driven for example by a motor located outside the conveyor line via a drive shaft.
- the pump housing is attached to the pumping device via one or more retaining elements.
- This type of holder may involve various disadvantages. On the one hand, an additional step for attaching the holder is needed. This increases the manufacturing costs and is resource-inefficient.
- the connection between the pump housing and the holder due to the production or due to the connection means used, for example screws or rivets, not without tension. This is because for the mounts and / or connecting means usually other materials are selected as for the pump housing.
- Another object is to provide a pumping device whose materials are as biocompatible as possible, easy to process, corrosion resistant and permanently connected to each other.
- Another object is to provide a pumping device that is configured as space-saving.
- Another object is to provide a pumping device which can be operated in an energy-saving manner.
- a further object is to provide a tension-free pump device, in particular with a tension-free housing or pump housing, and in particular to provide a stress-free transition from the pump housing to the remaining part of the pump device.
- an object is to provide a pump housing for a pumping device which can be easily and space-savingly incorporated into other components, e.g. a component housing of the pump device can be integrated.
- an object is to provide a pump housing for a pumping device that can be hermetically sealed to a component housing of the pumping device. Furthermore, an object is to provide a housing or pump housing, which is as free as possible from internal and / or external stresses.
- an object is to provide a method to produce a pump housing as possible cost and time saving.
- Another object is to provide a housing that can be hermetically sealed to other components.
- a first subject of the present invention is a pumping device including: i. an impeller;
- a pump housing surrounding at least a portion of an interior area with an inlet and an outlet
- impeller is provided in the interior of the pump housing
- the wall of the pump housing in at least one plane perpendicular to the longitudinal extent of the pump housing has at least a first portion and at least two further portions;
- the at least one first subregion comprises at least 60% by weight, based on the total mass of the at least one first subregion, of at least one non-magnetic material
- At least one ferromag netic material include
- each further subarea in the plane is adjacent to at least a first subarea
- the pumping device according to the invention is preferably suitable for being introduced into the body of a human or an animal.
- the pumping device according to the invention is further preferably designed for body fluids such as blood, serum, plasma, interstitial To promote fluid, saliva, or urine.
- body fluids such as blood, serum, plasma, interstitial To promote fluid, saliva, or urine.
- the introduction of the pump device according to the invention may, for example, include implantation in the body, placement on the body or connection to the body.
- the pump housing of the pumping device may have any shape that would be selected by a person skilled in the art for use in a pumping device.
- the pump housing preferably has at least one wall of the pump housing, hereinafter also referred to as pump housing wall.
- the at least one wall of the pump housing surrounds the interior of the pump housing.
- the pump housing has at least two ends with at least one inlet disposed at one end and at least one outlet at the other end.
- the interior of the pump housing is completely surrounded by the wall, except at the inlet and outlet of the pump housing.
- the pump housing may partially extend beyond the interior of the pump housing.
- the pump housing terminates at the inlet or outlet.
- the interior side facing away from the pump housing is referred to as the outside of the pump housing.
- the pump housing preferably has an elongated shape.
- the pump housing is defined in its shape by a longitudinal extent and at least one cross section.
- a cross section of the pump housing is always determined in a plane that is perpendicular to the pump housing wall. If the pump housing wall is curved in the longitudinal extent, then a cross section is determined perpendicular to the tangent at a point on the pump housing wall.
- the longitudinal extent is considered to be the expansion of the pump housing in the pumping direction. It is always the shortest, imaginary connection of inlet and outlet within the pump housing.
- the pump housing wall also referred to as a wall, extends in the direction of the longitudinal extent of the pump housing.
- the at least one wall may have one or more wall surfaces. If the pump housing has more than one wall surface, these are connected to each other via corners where the wall surfaces converge.
- the wall, and preferably also the wall surfaces, of the pump housing preferably extend parallel to the longitudinal extent of the pump housing. A portion of the pump housing wall may extend beyond the interior of the pump housing. Preferably, the pump housing wall extends over the entire inner region of the pump housing.
- the inlet is at the first end and the outlet is at the opposite end of the pump housing.
- At the ends of the pump housing preferably ends at least a portion of the pump housing wall.
- the part of the pump housing that projects beyond the interior into the environment is referred to as pump housing tongue.
- the pump housing at the first end, the inlet, a first opening to the inner region and at the other end, the outlet, a further opening to the inner region.
- the pump housing is fluid-conductively connected to its surroundings via inlet and outlet.
- the openings at the ends of the pump housing allow a flow of fluid through the interior of the pump housing.
- the fluid is, for example, a gas, a liquid, such as blood, or a mixture thereof.
- the first opening serves as a supply line of the fluid to be conveyed into the inner region of the pump housing and the further opening serves as a discharge of the fluid to be delivered.
- the pump housing may have further openings, for example in the wall of the pump housing.
- the pumping device according to the invention is implanted in a body in order, for example, to support the blood circulation and thus to relieve the heart, then the pumping device according to the invention is connected via lines to blood vessels of the body.
- the pump housing includes at least one cross-section, which is preferably selected from the group consisting of circular, rectangular or polygonal or ellipsoidal.
- the pump housing has an elongated shape at least in a first section.
- the pump housing may include at least one further portion whose shape deviates from the first portion of the pump housing.
- the total length of the pump housing is 1, 5 to 10 times, preferably 2 to 9 times, or preferably 2.5 to 8.5 times longer than the diameter of the pump housing.
- the length of the pump housing is preferably along the outer wall of the pump housing in
- the pump housing preferably has a length in a range of 1 mm to 10 cm, or preferably in a range of 2 mm to 8 cm, or preferably in a range of 5 mm to 5 cm.
- the pump housing preferably has an inner diameter in a range of 0.1 to 50 mm, or preferably in a range of 0.5 to 30 mm, or preferably in a range of 1 to 20 mm.
- the wall, in particular the at least one wall surface of the pump housing is preferably smooth. Smooth means that the wall of the pump housing has a roughness in a range of 0.025 to 4 Ra, or preferably in a range of 0.05 to 3 Ra, or preferably in a range of 0.07 to 1 Ra.
- the pump housing includes at least a first portion and at least one further portion.
- the first and the further subarea differ by their composition.
- the at least one first subregion preferably has at least one, particularly preferably all, of the following properties: maximum thermal stability;
- the at least two further subregions preferably have at least one, particularly preferably all of the following properties: highest possible thermal resistance;
- a pump housing can be obtained which combines one or more of the properties listed for the at least one first subarea and the at least two further subareas. At least a part of the at least one first partial area is connected to at least one part of the further partial areas.
- the connection can be an immediate connection of the two subregions or an indirect one.
- the at least one first subregion and the at least two further subregions are connected to one another in a material-locking manner. A cohesive connection is present if the material properties of the first subarea blended into the material properties of the further subarea. There is no sharp boundary between the two adjacent sections.
- This transitional area is also referred to as a third subarea for an indirect connection.
- both the materials of the first subarea and at least partially the materials of the further subarea are adjacent to one another and preferably form a mixture of the materials.
- the materials of the two subregions preferably enter into compounds at the atomic or molecular level. There are forces at the atomic or molecular level of the materials of the first and further subsections.
- Such a cohesive connection can usually be solved only by destruction of the pump housing. In most cases cohesive connections are achieved by sintering or by bonding materials.
- the at least one first portion contains at least 60 wt .-%, preferably at least 70 wt .-%, or preferably at least 90 wt .-%, based on the total mass of the first portion of a non-magnetic material.
- This is preferably a non-magnetic ceramic or a non-magnetic metal.
- a non-magnetic material is understood as meaning a material which has a magnetic permeability of less than 2 ⁇ , that is to say has no ferromagnetic properties.
- a ferromagnetic material is understood as meaning a material which has a magnetic permeability of more than 2 ⁇ .
- the at least one first portion includes the ceramic in a range of 60 to 100 wt .-%, or preferably in a range of 70 to 100 wt .-%, or preferably in a range of 80 to 100 wt .-%, based to the total mass of the first sub-division ches. Further preferably, the at least one first portion includes the ceramic to 100 wt .-%, based on the total mass of the first portion.
- the ceramic can be any ceramic that would be selected by a person skilled in the art for the pumping device according to the invention.
- the ceramic is preferably selected from the group consisting of an oxide ceramic, a silicate ceramic, a non-oxide ceramic or a mixture of at least two thereof.
- the oxide ceramic is preferably selected from the group consisting of a metal oxide, a semi-metal oxide or a mixture thereof.
- the metal of the metal oxide may be selected from the group consisting of aluminum, beryllium, barium, calcium, magnesium, sodium, potassium, iron, zirconium, titanium or a mixture of at least two thereof.
- the metal oxide is preferably selected from the group consisting of aluminum oxide (Al 2 O 3 ), magnesium oxide (MgO), zirconium oxide (ZrO 2 ), yttrium oxide (Y 2 O 3 ), aluminum titanate (Al 2 TiO 5 ), a piezoceramic such as lead zirconate ( PbZr0 3 ), lead titanate (PbTi0 3 ) and lead zirconate titanate (PZT) or a mixture of at least two thereof.
- the semimetal of the semimetal oxide is preferably selected from the group consisting of boron, silicon, arsenic, tellurium or a mixture of at least two thereof.
- the silicate ceramic is preferably selected from the group consisting of a steatite
- the non-oxide ceramic may be selected from the group consisting of a carbide, a nitride or a mixture thereof.
- the carbide may be selected from the group consisting of silicon carbide (SiC), boron carbide (B 4 C), titanium carbide (TiC), tungsten carbide, cementium (Fe 3 C).
- the nitride may be selected from the group consisting of silicon nitride (Si 3 N 4 ), aluminum nitride (AIN), titanium nitride (TiN), silicon aluminum oxynitride (SIALON), or a mixture of at least two thereof.
- the at least one first portion and the at least two further portions may be arranged in different ways within the pump housing.
- the housing preferably has the shape of a tube with a straight inner wall.
- protrusions may protrude, which consists of at least one the at least one first partial regions is formed or at least one of the at least two further partial regions or a combination of both types of partial regions. Examples of the arrangement of the various subregions in cross section including the protuberances are shown in FIGS. 3 and 4.
- Each transition from one sub-area to another sub-area may be arranged at right angles or at an angle other than 90 ° with respect to a cross-section of the pump housing. Furthermore, each transition may also be irregular, i. in cross-section, no imaginary grade line can be created on the transition. Furthermore, each transition from one subarea to another subarea, as an alternative or in addition to that described above with respect to a longitudinal section through a wall of the pump housing, may be arranged at right angles or at an angle different from 90 °. Furthermore, each transition may also be irregular, i. in longitudinal section, no imaginary grade line can be created on the transition. Furthermore, combinations of the aforementioned configurations of a transition in cross-section and in longitudinal section are preferred.
- At least one surface of the at least one first partial region points towards the inner region.
- the at least one first partial region or the at least two further partial regions can each form the entire wall thickness in a cross section in the plane of the pump housing at at least one position along the longitudinal extent of the pump housing.
- one part of the wall thickness may include the first part area and the other part of this wall thickness may include at least one further part area.
- the at least one first portion and the at least two further portions are configured as sections perpendicular or parallel to the longitudinal extent of the pump housing.
- the at least one first partial area completely surrounds at least one of the at least two further partial areas.
- the at least one first partial area preferably completely surrounds all of the at least two further partial areas.
- at least one surface of the first part region faces the outside of the pump housing.
- the at least one first partial area partially surrounds at least one of the at least two further partial areas.
- the at least one first partial area preferably partially surrounds all of the at least two further partial areas.
- at least one surface of the first subarea and of the further subarea points to the outside of the pump housing.
- At least the at least two further subregions in the form of protuberances in different spatial directions are away from the preferably cylindrical main body of the pump housing.
- the pumping device also includes a rotor in the form of the impeller.
- the impeller may be of any shape that would be selected by one skilled in the art.
- the impeller preferably has a diameter in a range of 1 mm to 10 cm, preferably in a range of 3 mm to 5 cm, or preferably in a range of 5 mm to 3 cm.
- the impeller preferably has a thickness in a range of 0.1 to 50 mm, preferably in a range of 0.5 to 20 mm, or preferably in a range of 1 to 15 mm.
- the diameter of the impeller is preferably smaller than the diameter of the pump housing in the plane of the impeller.
- the diameter of the impeller is preferably in a range of 1 to 10%, or preferably in a range of 1, 5 to 8%, or preferably in a range of 2 to 7%, based on the diameter of the pump housing in the plane of the impeller , smaller than the diameter of the pump housing.
- the impeller preferably has at least two rotor blades, preferably at least three rotor blades, or preferably at least five rotor blades. Particularly preferably, the impeller has a number of rotor blades in a range of 2 to 20, preferably in a range of 5 to 15, or preferably in a range of 8 to 13.
- the impeller preferably has a central axis of rotation about which the impeller can be rotated. The axis of rotation is also called the axis of rotation.
- the at least two rotor blades are preferably arranged symmetrically about the axis of rotation of the impeller.
- the impeller is preferably arranged in the interior of the pump housing, wherein the axis of rotation of the impeller is provided parallel to the longitudinal extent of the wall of the tube.
- the impeller may be made of any material that would be selected by a person skilled in the art for use in the pumping device according to the invention.
- the impeller has at least two regions: a first region in the center of the impeller around the rotation axis. This first area is also called core area. A second area, also called rotor area. This second region has at least two rotor blades which are suitable for conveying the fluid to be delivered.
- the impeller includes at least one element, the element having hard magnetic properties.
- a hard magnetic property means that a material obtains permanent magnetization as a result of exposure of that material in a magnetic field. The strength of a magnetizing field is chosen depending on the composition of the element. The necessary considerations and calculations are familiar to the expert.
- the induction of the impeller is preferably saturated. After the magnetic field has dropped, the magnetization of the hard magnetic material continues. Materials with hard magnetic properties can be used as permanent magnets.
- the at least one element is preferably arranged on the impeller so that it moves the impeller when it is alternately attracted or repelled by two independent electric or magnetic fields.
- the impeller preferably includes at least two elements with hard magnetic properties.
- the impeller can be controlled in its radial but also axial orientation.
- the elements with hard magnetic properties are used to store the impeller as possible contactless in the pump housing without further aids, such as bearings or other fixings in the pump housing. This allows a particularly low-friction and particularly low-wear operation.
- the at least one element can be realized for example by at least one rotor blade, which includes a hard magnetic material.
- a hard magnetic element may be arranged on at least one rotor blade.
- the hard magnetic element is provided in the core of the impeller.
- the at least one hard magnetic element preferably contains at least one magnetizable material, such as iron, cobalt, nickel,
- the at least one element can be arranged, for example, in the form of a coating of hard magnetic material on at least one rotor blade or in the interior of the impeller.
- at least 50%, or preferably at least 70%, or preferably 100% of the rotor blades comprise a hard magnetic material.
- the element contains at least 10 wt .-%, or preferably at least 20 wt .-%, or preferably at least 30 wt .-%, based on the total mass of the element, a hard magnetic metal.
- the element comprises a cobalt-chromium alloy or a platinum-cobalt alloy, in particular a platinum-cobalt alloy (PtCo23) with a proportion of cobalt of 23 wt .-% based on the total mass of the alloy. in a range of 10 to 100% by weight, or preferably in a range of 20 to 100% by weight, or preferably in a range of 30 to 100% by weight, based on the total mass of the element.
- PtCo23 platinum-cobalt alloy
- the impeller may have in its core, the area around the axis of rotation, a different material than in or on the rotor blades.
- the impeller may include a unitary material in the core and rotor blades.
- the material of the rotor blades can be flexible or inflexible.
- the material of the core of the impeller or the rotor blades of the impeller is in each case selected from the group consisting of a polymer, a metal, a ceramic or a combination or mixture of at least two thereof.
- the polymer may be selected from the group consisting of a chitosan, a fibrin, a collagen, a caprolactone, a lactide, a glycolide, a dioxanone, a polyurethane, a polyimide, a polyamide, a polyester, a polymethylmethacrylate, a polyacrylate, a Teflon, a copolymer of at least two thereof or a mixture of at least two thereof.
- the metal may be selected from the group consisting of iron (Fe), stainless steel, platinum (Pt), iridium (Ir), niobium (Nb); Molybdenum (Mo), tungsten (W), titanium (Ti), cobalt (Co), chromium (Cr), a cobalt-chromium alloy, tantalum (Ta), vanadium (V) and zirconium (Zr) or a of at least two of these, with particular preference being given to titanium, niobium, molybdenum, cobalt, chromium, tantalum, zirconium, vanadium and their alloys.
- the ceramic may be selected from the group consisting of alumina (Al 2 O 3 ), zirconia (ZrO 2 ), hydroxilapatite, tricalcium phosphate, glass-ceramics, alumina-reinforced zirconia (ZTA), zirconia-containing alumina (ZTA-Zirconia Toughened Aluminum-Al 2 0 3 / Zr0 2 ), yttrium-containing zirconium oxide (Y-TZP), aluminum nitride (AIN), titanium nitride (TiN), magnesium oxide (MgO), piezoceramics, barium (Zr, Ti) oxide, barium (Ce, Ti) oxide and Sodium potassium niobate or a mixture of at least two thereof.
- alumina Al 2 O 3
- ZrO 2 zirconia
- hydroxilapatite tricalcium phosphate
- glass-ceramics glass-ceramics
- ZTA zir
- the impeller may be coated on its outside, in particular on the outer surface of the rotor blades, with a biocompatible material. Suitable biocompatible materials are described further below.
- the impeller is preferably arranged in the inner region of the pump housing, which is surrounded by the first portion.
- the impeller is preferably arranged with its axis of rotation parallel to the longitudinal extent of the wall.
- the impeller can be aligned by a magnetic field in the pump housing.
- the impeller in the interior of the pump housing is preferably aligned by magnetic fields of electric coils on the outside of the pump housing.
- the coils preferably include an electrically conductive material.
- the electrically conductive material of the coils is selected from the group consisting of iron (Fe), copper (Cu), gold (Au), silver (Ag), platinum (Pt), palladium (Pd), titanium (Ti), chromium (Cr), cobalt (Co), tungsten (W) or a mixture of at least two thereof.
- the electrically conductive material includes copper (Cu).
- the pumping device according to the invention preferably includes at least two coils, preferably at least three coils, or preferably at least four coils. The coils are preferably arranged on the outside of the pump housing, wherein the coils and the impeller preferably lie in one plane. They are then arranged on the outside of the pump housing around the impeller.
- the pump housing includes at least as a base body a tube.
- the tube is straight.
- the tube may have at least one bend.
- the tube is preferably closed except for an inlet such as an outlet. This means that the pipe has no other openings besides the two openings at the inlet and outlet.
- the dimensions, materials and configurations preferably correspond otherwise to those of the previously described pump housing.
- the non-magnetic material of the at least one first portion selected from the group consisting of a cermet, alumina (Al 2 0 3 ), zirconia (Zr0 2 ), an alumina-containing zirconia (ATZ), a Zirconia-containing aluminum oxide (ZTA), an yttrium-containing zirconium oxide (Y-TZP), aluminum nitride (AIN), Magnesium oxide (MgO), a piezoceramic, barium (Zr, Ti) oxide, barium (Ce, Ti) oxide and sodium potassium niobate, a platinum alloy, a titanium alloy, a niobium alloy, a tantalum Alloy, a molybdenum alloy, a stainless steel (AISI 304, AISI 316 L) or a mixture of at least two of them.
- a cermet alumina (Al 2 0 3 ), zirconia (Zr0 2 ), an alumina-
- a "cermet" is understood as meaning a composite material of one or more ceramic materials in at least one metallic matrix or a composite material of one or more metallic materials in at least one ceramic matrix Powder and at least one metallic powder may be used, which may for example be treated with at least one binder and optionally at least one solvent
- a selection for the ceramic constituents and the metallic constituents of the cermet may be composed of those specified for the first portion
- a non-magnetic cermet is a composite of a non-magnetic ceramic and a non-magnetic metal, as mentioned later.
- the at least one first portion includes a non-magnetic metal in a range of 40 to 90 wt .-%, based on the total mass of the at least one first portion.
- the non-magnetic metal is selected from the group consisting of platinum (Pt), iridium (Ir), niobium (Nb), molybdenum (Mo), tungsten (W), titanium (Ti), chromium (Cr), tantalum (Ta), zirconium (Zr), alloys of the aforesaid metals, palladium (Pd), gold (Au), non-magnetic stainless steel (eg AISI 304, AISI 316 L) or a mixture of at least two thereof.
- the non-magnetic metal may preferably be selected from the group consisting of titanium (Ti), platinum (Pt), tantalum (Ta), niobium (Nb), or a mixture of at least two thereof. If the content of the non-metallic metal is less than 60% by weight of the first portion, the further non-magnetic material may preferably be at least 60% by weight of a non-magnetic ceramic or a non-magnetic cermet as described above. non-magnetic material, based on the total mass of the first sub-area to be supplemented.
- the ferromagnetic material of the further subrange is selected from the group consisting of iron (Fe), cobalt (Co), nickel (Ni), chromium dioxide (CrO 2 ), an iron alloy, an iron Nickel alloy, iron-silicon alloy, iron-cobalt alloy, nickel alloy, aluminum-nickel alloy, cobalt alloy, cobalt-platinum alloy, cobalt-chromium alloys, a neodymium-iron-boron alloy, a samarium-cobalt alloy or a mixture of at least two thereof.
- the at least two further portions of the pump housing preferably contain a metal content in a range of 41 to 90 wt .-%, preferably in a range of 45 to 85 wt .-%, or in a range of 60 to 80 wt .-%, based on the total mass of the other subarea.
- At least one of the at least two further subregions further contains a component selected from a ceramic, a metal or a mixture thereof.
- the ceramic is preferably selected from the group of ceramics which are specified for the first subregion.
- At least one of the at least two partial regions preferably has the same ceramic as the first partial region.
- the at least two further partial regions preferably contain the ceramic in a range from 1 to 49% by weight, or preferably in a range from 2 to
- the further metal may include a metal that has no ferromagnetic properties. These are preferably the metals that were also specified for the first part. The sum of all components of the further sub-range always gives 100 wt .-%.
- the pump housing includes at least a first partial area and at least two further partial areas.
- the pump housing may have a plurality of first portions and a plurality of further portions.
- the pump housing preferably has a number of first partial regions in a range from 1 to 10, preferably from 1 to 8, or preferably from 1 to 5.
- the pump housing preferably has a number of further subregions in a range from 1 to 10, preferably from 2 to 8, or preferably from 2 to 5.
- the pump housing includes a first portion and three further portions.
- the at least one first and the at least two further subregions can be the same size or alternatively have different sizes.
- the at least one first subarea and the at least two further partial regions preferably extend over the entire thickness of the pump housing wall.
- the at least one first partial region preferably has a width, based on the longitudinal extent of the pump housing, in a range of 1 to 100 mm, preferably in a range of 2 to 70 mm, or preferably in a range of 3 to 50 mm.
- the at least two further subareas preferably have a width based on the longitudinal extent of the pump housing, in a range of 0.5 to 80 mm, preferably in a range of 1 to 60 mm, or preferably in a range of 2 to 20 mm.
- the pump housing has a volume in a range of 0.1 cm 3 to 10 cm 3 , preferably in a range of 0.2 to 9 cm 3 , or preferably in a range of 0.5 to 5 cm 3 up.
- the dimensions such as length, diameter and wall thickness of the pump housing are preferably as already indicated above.
- the volume of the pump housing is defined by the interior surrounded by the pump housing.
- the wall of the pump housing preferably has a thickness in a range of 0.1 to 5 mm, or preferably in a range of 0.3 to 4 mm, or preferably in a range of 0.4 to 3 mm. In the following, either wall thickness or wall thickness is used in this context.
- the wall thicknesses can vary in at least one of the first or the further subregions.
- An increase in the wall thickness at at least one point of the pump housing may serve to maintain the impeller at least in one direction at its position in the pump housing.
- the at least one first subregion contains less than 10% by weight, preferably less than 5% by weight, or preferably less than 3% by weight, based on the total mass of the first subregion on magnetic metal.
- the sum of all components of the first sub-range always gives 100 wt .-%.
- the metal of the first subregion is preferably selected from the group consisting of platinum (Pt), iron (Fe), stainless steel (AISI 304, AISI 316 L), iridium (Ir), niobium (Nb), molybdenum (Mo), tungsten ( W), titanium (Ti), cobalt (Co), chromium (Cr), a cobalt-chromium alloy, tantalum (Ta), and zirconium (Zr) or a mixture of at least two thereof.
- the metal is selected from the group consisting of titanium, niobium, molybdenum, cobalt, chromium, tantalum and their alloys or a mixture of at least two thereof.
- the third subregion has a metal content between the metal content of the first subregion and the metal content of one of the further subregions.
- the third subregion may be located between the at least one first and the at least one further subregion due to the manufacturing process of the pump housing. Alternatively, in the manufacturing process, a third subregion may have been introduced at least between a first and a further subregion.
- the third portion preferably includes a ceramic and a metal.
- the ceramic is preferably selected from the ceramics listed for the first subarea.
- the metal is preferably selected from the metals listed for the further subrange.
- the third portion includes the ceramic preferably in a range of 10 to
- the third subregion preferably contains the metal in a range from 10 to 89% by weight, or preferably in a range from 20 to 80% by weight or preferably in a range from 30 to 70% by weight, based on the total mass of the third subarea. The sum of all components of the third sub-range always gives 100 wt .-%.
- the third subregion preferably has a metal content which results from the mean value of the metal content of the first subregion and of the further subregion.
- the third subarea can serve to reduce or minimize stresses between the different materials of the first and the further subarea.
- the connection between the first and the third portion is cohesively.
- the connection between the second and the third portion is also cohesively.
- the first, the further and the third portion of the same ceramic or the same ceramics and the same metal or the same metals.
- Pumping device on a component housing which is hermetically sealed to the pump housing.
- at least a part of the pump housing is surrounded to a part of a component housing. It is preferred that at least a part of the at least one first portion of the pumping device is connected to the component housing.
- the connection of the component housing with at least one part of the pump housing preferably leads to a closed space between the component housing and the pump housing.
- the interior of the component housing of the pumping device is hermetically sealed against the environment.
- the here according to the invention proposed medically implantable Pumping device can be used in particular in a body of a human or animal user, in particular a patient. An implanted pump device is typically exposed to a fluid of body tissue of the body.
- the component housing of the medically implantable device and thus also the component housing and the pump housing of the pumping device according to the invention, should have a complete impermeability, in particular to body fluids.
- connection of component housing with pump housing are preferably hermetically sealed.
- the interior of the pumping device is hermetically sealed against the outside space.
- hermetically sealed means that, when used as intended, moisture and / or gases can not penetrate the hermetically sealed connection within a customary period of five years, a physical quantity for determining the tightness of a connection or a component Leakage tests can be performed by leak testing, and leak tests will be carried out with helium leak testers and / or mass spectrometers, and are specified in the Mil-STD-883G Method 1014.
- the maximum allowable helium leak rate will vary depending on internal volume According to the methods specified in MIL-STD-883G, Method 1014, paragraph 3.1, and taking into account the volumes and wells of the devices under test in the application of the present invention, the maximum allowable helium leak rate for the invention Pump housing 10 7 atm * cm 3 / sec or less. This means that the device to be tested (for example the component housing and / or the pumping device according to the invention or the component housing with the connected pump housing) has a helium leak rate of less than 1 ⁇ 10 -7 atm * cm 3 / sec or less.
- the helium leak rate of less than 1 x 10 -8 atm * cm 3 / sec, in particular less than 1 x 10 "9 atm * cm 3 / sec.
- the helium mentioned The equivalent standard air leak rate definition and conversion are given in the ISO 3530 standard.
- the pump device preferably has, in addition to the impeller, the pump housing with a first and the at least two further partial areas preferably a component housing. housing, in which further components of the pumping device can be located.
- the other components of the pump device are preferably selected from the group consisting of a battery, a coil, a control unit, a vascular connection unit or a combination of at least two thereof.
- the component housing contains titanium to at least 30 wt .-%, preferably at least 50 wt .-%, or preferably at least 80 wt .-%, each based on the total mass of the component housing. More preferably, the component housing contains titanium to at least 99 wt .-%, based on the total mass of the component housing. Furthermore, the component housing may preferably include at least one other metal. The other metal may be selected from the same group as the metal of the other part.
- the device package may preferably contain the further metal in a range of 1 to 70 wt%, or preferably in a range of 5 to 50 wt%, or preferably in a range of 10 to 20 wt%. The sum of all components of the component housing always gives 100 wt .-%. Suitable titanium grades are given in ASTM B265-05: 201 1, for example Grade 1 to 6.
- the at least one first portion of the pump housing has a magnetic permeability of less than 2 ⁇ , preferably less than 1, 9 ⁇ , or preferably less than 1, 8 ⁇ .
- the magnetic permeability is determined according to ASTM 773-01: 2009.
- the surface of the first portion which faces the interior of the pump housing, a Vickers hardness of at least 330 HV, preferably at least 350 HV, or preferably at least 370 HV.
- the entire at least one first portion has a hardness in the specified ranges.
- At least the surface of the at least one further subarea also has a Vickers hardness of at least 330 HV, preferably at least 350 HV, or preferably at least 370 HV. Often the hardness is not higher than 2000 HV, or preferably not higher than 1500 HV.
- the hardness of at least the surface of the at least one first subregion is preferably in a range from 330 to 2000 HV, or preferably in a range from 350 to 1800 HV.
- at least the surface of the at least one first partial region preferably has a hardness that is at least as great as the hardness of the rotor surfaces of the impeller.
- at least the surface of the at least one first portion has a hardness which is at least 20 HV, or preferably by at least 30 HV, or preferably by at least 40 HV higher than the hardness of Vickers rotor surfaces of the impeller.
- the near-surface material layer is in a range of 0.01 to 2.5 mm, preferably in a range of 0.05 to 1.0 mm, or preferred in a range of 0.1 to 0.5 mm, each perpendicular to the surface understood.
- At least the outer surfaces of the component housing and the surface facing the inner region of the pump housing are biocompatible. This is particularly preferred when the pumping device is for implantation in a living body, such as a human or animal. Biocompatibility is determined and assessed in accordance with standard ISO 10993-4: 2002. In general, the surfaces facing the interior of the pump housing and the outer surfaces of the component housing after implanting the invention
- Another object of the present invention is a method for producing a pump housing for a pumping device comprising the steps:
- step a. and the other material in step b. can be done in any manner that the skilled person would choose for this purpose.
- the formation of the pump housing precursor can be done in any manner that would be selected by those skilled in the art for the purpose of forming a first portion and at least two further portions.
- step c. a shaping process, preferably selected from the group consisting of a lithographic process, an injection molding, a machining, an extrusion or a combination of at least two thereof.
- various layers of one or more materials are sequentially placed in a mold.
- the lithographic process preferably corresponds to a layered screen printing process.
- a sieve consisting of a dimensionally stable as possible material, such as wood; Metal, preferably steel; a ceramic or a plastic with a selected mesh size on the object to be overlaid or over the object to be overlaid arranged.
- a nozzle or from a container used for applying or superimposing pressure mass for example in the form of a paste or a powder, and pressed with a squeegee through the mesh of the sieve.
- pressure mass for example in the form of a paste or a powder
- a uniform film of the printing material used for overlaying can be applied or areas with little or no pressure applied for application can alternate with areas with a large amount of pressure applied for application.
- a uniform film of the printing material used for superimposing is transferred to the surface.
- the screen meshes can also be partially closed by suitably applied materials (copy layers, screen printing stencils) so that the printing composition is transferred only in defined areas with open meshes to the surface to be coated so as to obtain, for example, a defined structure such as a pattern.
- screening thin films with defined openings can be used to transfer the printing mass. By repeating this process with one and the same material or different materials, 3-D structures can be obtained.
- Injection molding is a molding process for at least one material to obtain a shaped solid.
- the person skilled in the art is familiar with various injection molding methods as well as tools and conditions used in injection molding. conditions known from the prior art.
- the injection molding may be selected from the group consisting of a multi-component injection molding, a powder injection molding, an injection-compression molding, an extrusion injection molding, a vacuum injection molding or a combination of at least two thereof.
- Machining can be combined with any other molding process.
- a solid body is structured by using cutting tools, such as a drill or a punch. During structuring, part of the material is removed.
- massive bodies can be formed into hollow bodies, for example.
- machining may also be a processing step after manufacturing a pump housing or housing. In addition to machining, polishing may also take place following the manufacture of the pump housing.
- a first material for forming a first portion is brought into contact with another material for forming the further portion.
- the contacting takes place preferably in the form of injection molding, in which successively first the further material is injected into a mold made of metal and then the first material.
- the quantitative ratios in the first and further material preferably correspond to the proportions in the first and in the further subarea, as described above in connection with the first article, the pumping device according to the invention.
- the first and the further material may contain additives.
- the pump housing precursor already has the shape of the pump housing after contacting.
- the two materials form a continuous form.
- the contacting may involve one or more further steps.
- a third material which preferably has a composition such as the third subregion of the pumping device according to the invention described above, can be introduced between the first material and the further material in the pump housing precursor.
- any substance that would be selected by a person skilled in the art as an additive for the first material can be selected.
- the additive is preferably selected from the group consisting of water, a dispersant, a binder or a mixture of at least two thereof.
- the dispersant preferably contains at least one organic substance.
- the organic substance preferably has at least one functional group.
- the functional group may be a hydrophobic or a hydrophilic functional group.
- the functional group may be selected from the group consisting of an ammonium group, a carboxylate group, a sulfate group, a sulfonate group, an alcohol group, a multiple alcohol group, an ether group or a mixture at least two of them.
- the dispersant preferably has functional groups in a range of 1 to 100, or preferably in a range of 2 to 50, or preferably in a range of 2 to 30.
- Preferred dispersants are from Byk-Chemie GmbH, DOLAPIX CE 64 & Zschimmer & Schwarz GmbH & Co KG under the trade name DISPERBYK ® 60th
- the binder is preferably selected from the group consisting of a methylcellulose, a thermoplastic polymer, a thermosetting polymer and a wax or a mixture of at least two thereof.
- the methylcellulose is preferably selected from the group consisting of hydroxypropylmethylcellulose (HPMC), hydroxyethylmethylcellulose (HEMC), ethylmethylcellulose (EMC) or a mixture thereof.
- HPMC hydroxypropylmethylcellulose
- HEMC hydroxyethylmethylcellulose
- EMC ethylmethylcellulose
- HPMC hydroxypropylmethylcellulose
- the methylcellulose contains hydroxypropylmethylcellulose in a range of 80 to 100% by weight, or preferably in a range of 90 to 100% by weight, or preferably in a range of 95 to 100% by weight .-%, based on the total mass of methylcellulose.
- the methylcellulose has a content of -OCH 3 groups in a range of 20 to 40 wt .-%, or preferably in a range of 23 to 37 wt .-%, or preferably in a range of 25 to 35 wt .-% , based on the total mass of methyl cellulose.
- the methylcellulose has a content of -OC 3 H 6 OH groups in a range of 1 to 12 wt .-%, or preferably in a range of 3 to 9 wt%, or preferably in a range of 4 to 8 Wt .-%, based on the total mass of methylcellulose.
- the thermoplastic polymer may be selected from the group consisting of acrylonitrile-butadiene-styrene (ABS), polyamides (PA), polylactate (PLA), polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyethylene (PE ), Polypropylene (PP), polystyrene (PS), polyetheretherketone (PEEK) and polyvinylchloride (PVC) or a mixture of at least two of them.
- the thermosetting polymer may be selected from the group consisting of an aminoplast, an epoxy resin, a phenolic resin, a polyester resin or a mixture of at least two of them.
- Waxes are hydrocarbon compounds that melt above 40 ° C without decomposition.
- the first material preferably contains at least one of the aforementioned additives in a range of 0.1 to 10 wt%, or preferably in a range of 0.2 to 8 wt%, or preferably in a range of 0.5 to 5 wt .-%, based on the total mass of the first material.
- the other material preferably contains at least one of the aforementioned additives in an amount in a range of 0.1 to 5 wt%, or preferably in a range of 0.2 to 2 wt%, or preferably in a range of 0 , 3 to 1 wt .-%, each based on the total weight of the other material.
- Treating the pump housing precursor in step d. may be done in any manner that a person skilled in the art would select for the purpose of heating the pump housing precursor to at least 300 ° C.
- at least a portion of the treatment of the pump housing precursor takes place at a temperature in a range of 300 to 2500 ° C, or in a range of 500 to 2000 ° C, or in a range of 700 to
- the Treatment of the Pumpengephasevor innovatorrs at elevated temperature preferably escapes at least a portion of the binder.
- the treatment of the Pumpengeophusevor essencers can be done for example in an oxidative atmosphere, a reductive atmosphere or under a protective atmosphere.
- an oxidative atmosphere may contain oxygen, such as air or an oxygen / air mixture.
- a reductive atmosphere may contain hydrogen.
- a protective atmosphere preferably contains neither oxygen nor hydrogen. Examples of protective atmospheres are nitrogen, helium, argon, krypton or mixtures thereof.
- the choice of atmosphere may be dependent on the materials to be treated. The person skilled in the appropriate choice of the atmosphere for the mentioned materials is known. It is also preferable to successively select combinations of different atmospheres for different periods of time.
- the treatment of the pump housing precursor can be done either in one step or preferably in more than one step.
- the pump housing precursor is in a first sub-step of step d. to a temperature in a range of 301 to 600 ° C, or preferably in a range of 350 to 550 ° C, or preferably in a range of 400 to 500 ° C.
- This first partial step of the treatment step d. may be over a period of time in a range of 1 to 180 minutes, preferably in a range of 10 to 120 minutes, or preferably in a range of 20 to 00 minutes.
- This sub-step can be accomplished either by introducing the pump housing precursor from step c.
- step d. of the pump housing precursor in one step to a temperature in a range of 301 to 600 ° C made.
- the pump housing precursor is preferably at a temperature in a range of 800 to 2500 ° C, or preferably in a range of 1000 to 2000 ° C, or preferably heated in a range of 1100 to 1800 ° C.
- This partial step can also be achieved either by introducing the pump housing precursor from the first substep of step d. done in a preheated atmosphere or by slow stepwise or steadily increased heating of the Pumpengeophusevor organizerrs.
- the treatment of the pump housing precursor in the second sub-step is carried out over a period of time in a range of 1 to 180 minutes, preferably in a range of 10 to 120 minutes, or preferably in a range of 20 to 100 minutes.
- the shape of the pump housing after the manufacturing process is preferably continuous. This means that the pump housing next to the outlet and the inlet has no other openings or outlets, or other recesses.
- the pump housing has a rectilinear outer surface.
- the wall thicknesses can vary in at least one of the first or the further subregions. An increase in the wall thickness at at least one point of the pump housing may serve to hold the impeller at least in one direction at its position in the pump housing.
- a pumping device according to the invention is obtainable by inserting an impeller into a pump housing, arranging electromagnets with coils around the pump housing, producing a circuit incorporating a control device and a power source, eg a battery.
- the pump device according to the invention is surrounded by a component housing and the other portions of the pump housing with the component housing materially connected. This can be done, for example, by a solder joint along the point of contact of the pump housing and component housing.
- Another object of the present invention is a pump housing for a pumping device obtainable by the inventive method described above.
- a further subject of the present invention is a housing, which surrounds an inner area at least in part, with a first end and a second end,
- the wall of the housing has in at least one plane perpendicular to the longitudinal extension of the housing at least a first portion and at least one further portion;
- the at least one first subregion comprises at least 60% by weight, based on the total mass of the at least one first subregion, of at least one non-magnetic material
- the at least one further subregion comprises at least 41% by weight, based on the total mass of the at least one further subregion, of at least one ferromagnetic material, wherein the at least one further subregion is adjacent in the plane and the at least one first subregion is adjacent in the plane , and wherein the at least one first partial area and the at least one further partial area are connected to one another in a material-locking manner.
- the housing corresponds in its shape, its composition and its other configuration of the pump housing, which has been previously described in connection with the pumping device according to the invention.
- a displaceable element is provided in the housing at least in a part of the housing. Further preferred embodiments correspond to the previously described embodiments of the pumping device according to the invention
- the displaceable element may be selected from the group consisting of a sphere, a cylinder, an air bubble or a combination of at least two thereof.
- the displaceable element preferably has a shape which corresponds to the diameter of the pump housing.
- the material of the displaceable element can be any that would be used by a person skilled in the art.
- the displaceable element includes a metal, a polymer, a ceramic or a mixture thereof.
- the metal or polymer may be selected from a metal, a polymer or a ceramic as described for the first portion of the pump housing.
- the displaceable element can be displaced in its position in the housing, for example by changing the fluid flow in the housing.
- a current flow can be triggered in a coil and recorded by means of a current flow measurement .
- Another object of the present invention is a pumping device comprising at least one previously described housing or a pump housing obtainable by a method described above.
- test loads and materials were determined according to the standard according to DIN EN ISO 6507-March 2006. The following test loads and exposure times were used: 1 kg, 15 seconds. The test temperature was 23 ° C ⁇ 1 ° C
- Magnetic Permeability The magnetic permeability was determined according to ASTM A773 / A773 - 01 (2009)
- Biocompatibility will be determined according to the standard of 10993-4: 2002.
- Leak tests will be carried out with helium leak testers and / or mass spectrometers.
- a standard measuring method is specified in the standard MN-STD-883G Method 1014.
- the maximum allowable helium leak rate is determined depending on the internal volume of the device to be tested. According to the methods specified in paragraph 3.1 of MIL-STD-883G, Method 1014, and taking into account the volumes and cavities of the devices to be tested in the application of the present invention, the maximum allowable helium leakage rate for the pump housings 10 7 according to the invention atm * cm 3 / sec or less.
- the device to be tested (for example the component housing and / or the pumping device or the component housing with the connected pump housing) has a helium leak rate of less than 1 ⁇ 10 -7 atm * cm 3 / sec or less.
- said helium leak rates can also be converted to the equivalent standard air leak rate.
- the equivalent standard air leak rate definition and conversion are given in the ISO 3530 standard.
- the further material contains a mixture of 45 wt .-% of a Pt-Co-23 material of the company Heraeus Holding GmbH and 45 wt .-% alumina (Al 2 0 3 ) available from CeramTech GmbH, and 10 wt .-% of the binding agent METAWAX P-50 available from Zschimmer & Schwarz GmbH & Co.KG.
- the first material contains 50% by weight of platinum powder from Heraeus Precious Metals GmbH & Co. KG and 50% by weight of aluminum oxide (Al 2 O 3 ) from CeramTech GmbH.
- the further material contains a mixture of 50 wt .-% of a Pt-Co-23 material of the company Heraeus Holding GmbH and 50 wt .-% alumina (Al 2 0 3 ) available from CeramTech GmbH. If not specified here, the particle sizes of the materials can be found in the product data sheet, which is available from the raw materials supplier and is often attached to a delivery.
- the first material of Example 1 is first provided in a container according to the inventive method for the preparation of a pump housing.
- the further material from Example 2 is also provided in a container.
- the powders of the further material and the first material may be placed in the mold as shown in Figure 5 and compressed with a die.
- a pump housing precursor is obtained, which is first treated in a furnace at a temperature of 400 ° C and then sintered at a temperature of 1700 ° C to to obtain a pump housing with at least a first portion having the composition of Example 3 and at least one further portion having the composition of Example 4.
- FIG. 1 shows a schematic representation of a pump device according to the invention
- Figure 2 is a diagram of a method for producing a pump housing according to the invention.
- Figure 3a-b is a schematic representation of a pump housing according to the invention with a first and a further portion directly adjacent to each other arranged;
- Figure 4a-b is a schematic representation of a pump housing according to the invention with a first and a further portion separated by a third portion arranged; shown.
- FIG. 1 schematically shows a pump device 10, which has a pump housing 20, in the form of a tube, and a component housing 40.
- the outer surfaces 100 of the component housing 40 come into contact with the body, in particular for an implantable pump device 10, and are therefore preferably made biocompatible
- the pump housing 20 has a wall 21 which surrounds an interior region 50.
- the area of the pump housing 20 facing the inner region 50 is referred to as the facing surface 102.
- the facing surface 102 comes into contact with the fluid and is therefore preferably made biocompatible, in particular for an implantable pump device 10.
- In the inner region 50 of the pump housing 20 is at least one impeller 80, in this case, there are two impeller 80 in the pump housing 20.
- the pump housing 20 has a first portion 26 in the middle of the wall 21.
- the wall 21 or the pump housing 20 has a first further subregion 28.
- the further end 24 On the opposite side of the pump housing 20 is the further end 24, in the form of the outlet 24, containing the further opening 25.
- a fluid in the pumping direction 240 can be pumped from the inlet 22 to the outlet 24.
- Further components such as a battery 120 and a control unit 130, are located between the component housing 40 and the pump housing.
- two coils 32 and 32 ' are located in the component housing 40.
- the coils 32 and 32 ' can either surround the at least two further ones Subregions 28, 28 'be arranged or at a located elsewhere in the component housing 40.
- the further partial regions 28, 28 ' are designed as protuberances from the otherwise tubular pump housing 20.
- FIG. 2 schematically shows the sequence of the method for producing a pump housing.
- a first material 60 is provided.
- the first material 60 is for example a mixture of at least two powders.
- the first material contains the composition of Example 1
- the further material 70 is provided in the form of a mixture Example 2.
- the container may be a metal container with a sieve gangway.
- the powder grains preferably have a round to oval extent.
- the particle size specification D 50 means that not more than 50% of the particles are larger than the specified diameter.
- the particle size specification D 90 means that not more than 90% of the particles are larger than the specified diameter.
- the particle size can be determined by various methods.
- the grain size is determined by means of laser diffraction, light microscopy, optical single particle counting or a combination of at least two thereof.
- the determination of the particle size as well as the particle size distribution is preferably carried out on the basis of individual optical evaluation of images by means of transmission electron microscopy (TEM).
- TEM transmission electron microscopy
- a pump housing precursor 90 is formed from the first material 60 and the further material 70.
- the steps c. or c) 200 are two alternatives which can be used in the formation of the pump housing precursor 90.
- a further subregion 28 is formed by the further material 70.
- the further material 70 is printed by means of a Teflon blade with the dimensions 10 mm * 4 mm * 2 mm and a doctor blade hardness of 50 shore in a first form of an aluminum oxide ceramic. The first form is open on one side.
- the first material 60 is pressed into a further shape as described for the further material. The other shape is open to one side. With a stainless steel punch, the first and further materials 70 are compressed under a pressure of 10Kg.
- FIG. 3 a shows a cross section (in a plane Q) through a pump housing 20 produced as described above.
- the core of the tubular pump housing 20 is formed by a first portion 26, in which many other portions 28 and 28 ' protrude.
- the further partial regions 28 and 28 ' form protuberances from the pump housing 20 in all four directions of the sky.
- the surface of the inner region 50, consequently the surface 102 facing the inner region 50, is formed exclusively by a first partial region 26 in this embodiment.
- FIG. 3b likewise shows a cross section (in the plane Q) through a pump housing 20 according to the invention.
- the arrangement of the further subregions 28 and 28 ' are identical to those of Figure 3a and protrude in all directions in many directions from the tubular body of the pump housing to the outside.
- the further subregions 28, 28 ' in the embodiment from FIG. 3b are surrounded by the first subregion 26.
- the entire outer surface of the pump housing 20 includes the first portion 26.
- FIG. 4 a again shows a pump housing 20 with protuberances from the tubular base body of the pump housing 20.
- the further partial regions 28 and 28 ' all project through the wall thickness of the pump housing 20 as far as the inner region 50.
- the inner region 50 therefore has on its facing surface 102 both parts of the first partial region 26 and parts of further partial regions 28, 28 ' .
- the first portion 26 protrudes at the inlet 22 and the outlet 24 on the other portions 28, 28 ' addition.
- the embodiment from FIG. 4 b has the same shape and arrangement of the first 26 and further partial regions 28, 28 ' , with the difference that the further partial regions 28 and 28 ' alternate in the circumference of the pump housing 20. This has the consequence that at the first opening 23 at the inlet 22 and at the further opening 25 at the outlet 24 both types of the partial regions, ie both at least one first partial region 26 and at least the two partial regions 28, 28 ' terminate.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013211844.9A DE102013211844A1 (de) | 2013-06-21 | 2013-06-21 | Pumpengehäuse aus einem magnetischen und einem nichtmagnetischen Material |
| PCT/EP2014/001686 WO2014202227A1 (de) | 2013-06-21 | 2014-06-20 | Pumpengehäuse aus einem magnetischen und einem nichtmagnetischen material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3011184A1 true EP3011184A1 (de) | 2016-04-27 |
| EP3011184B1 EP3011184B1 (de) | 2021-04-21 |
Family
ID=51176317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14738377.2A Active EP3011184B1 (de) | 2013-06-21 | 2014-06-20 | Pumpengehäuse aus einem magnetischen und einem nichtmagnetischen material |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US10539140B2 (de) |
| EP (1) | EP3011184B1 (de) |
| CN (1) | CN105940222A (de) |
| DE (1) | DE102013211844A1 (de) |
| SG (1) | SG11201510523QA (de) |
| WO (1) | WO2014202227A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013211844A1 (de) | 2013-06-21 | 2014-12-24 | Heraeus Precious Metals Gmbh & Co. Kg | Pumpengehäuse aus einem magnetischen und einem nichtmagnetischen Material |
| DE102013211848A1 (de) | 2013-06-21 | 2014-12-24 | Heraeus Precious Metals Gmbh & Co. Kg | Pumpengehäuse aus mindestens zwei unterschiedlichen versinterbaren Materialien |
| DE102014004121A1 (de) | 2014-03-24 | 2015-09-24 | Heraeus Deutschland GmbH & Co. KG | Pumpengehäuse aus mindestens drei unterschiedlichen versinterbaren Materialien |
| DE102018214650A1 (de) * | 2018-08-29 | 2020-03-05 | KSB SE & Co. KGaA | Strömungsführende Vorrichtung |
| EP4147746A1 (de) | 2021-09-10 | 2023-03-15 | Greatbatch Ltd. | Keramikverstärkter metallverbundstoff für hermetische körper für implantierbare vorrichtungen |
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-
2013
- 2013-06-21 DE DE102013211844.9A patent/DE102013211844A1/de not_active Ceased
-
2014
- 2014-06-20 WO PCT/EP2014/001686 patent/WO2014202227A1/de not_active Ceased
- 2014-06-20 SG SG11201510523QA patent/SG11201510523QA/en unknown
- 2014-06-20 CN CN201480046036.1A patent/CN105940222A/zh active Pending
- 2014-06-20 US US14/900,515 patent/US10539140B2/en not_active Expired - Fee Related
- 2014-06-20 EP EP14738377.2A patent/EP3011184B1/de active Active
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| See references of WO2014202227A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014202227A1 (de) | 2014-12-24 |
| US20160369805A1 (en) | 2016-12-22 |
| EP3011184B1 (de) | 2021-04-21 |
| CN105940222A (zh) | 2016-09-14 |
| DE102013211844A1 (de) | 2014-12-24 |
| US10539140B2 (en) | 2020-01-21 |
| SG11201510523QA (en) | 2016-01-28 |
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